How do you get ps2 games online to work on a ps3?

i have timespitters future perfect and pro evo, two games i wud like to go online with, with the ps3. however both games seem to not allow me to go online with them, how do you get them to go online. not just them games but others

when ppl say use a memory card off the ps2 data to do it, what do they mean, i am so confused =[How do you get ps2 games online to work on a ps3?
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